I was thinking balance might be used as an indicator. The VH 1-frame 12ga I have beside me right now balances perfectly with one finger directly under the hinge. I am below a neophyte in terms of Parker experience, but I would think the balance point would be moved back toward the stock if one or more barrels had been back bored. A variance in bore diameter AND a rearward balance point might lend itself to further suspicion. ???
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Will makes some excellent points and I agree with all of them. - Dean Romig 03-13-2013
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